Add default config when init

update JsonEncoder

fastapi_cache/key_builder.py

@@ -0,0 +1,19 @@
+from typing import Optional
+
+from starlette.requests import Request
+from starlette.responses import Response
+
+
+def default_key_builder(
+    func,
+    namespace: Optional[str] = "",
+    request: Request = None,
+    response: Response = None,
+    *args,
+    **kwargs,
+):
+    from fastapi_cache import FastAPICache
+
+    prefix = FastAPICache.get_prefix()
+    cache_key = f"{prefix}:{namespace}:{func.__module__}:{func.__name__}:{args}:{kwargs}"
+    return cache_key